Excavator



FIG. 1 is a first perspective view of an excavator showing our new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a plan view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is aright side view thereof; and,

FIG. 8 is a left side view thereof. 

CLAIM The ornamental design for an excavator, as shown and described. 